XML 70 R34.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Organization of the Parent Company and The Operating Partnership (Details) | Mar. 31, 2015 sqft real_estate_investment | Mar. 31, 2014 sqft
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Parent Company [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Ownership in the Operating Partnership | 99.10%us-gaap_MinorityInterestOwnershipPercentageByParent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net rentable square feet | 24,900,000 us-gaap_AreaOfRealEstateProperty / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Area Owned by Company of Undeveloped Parcels Of Land | 415 bdn_AreaOwnedbyCompanyofUndevelopedParcelsOfLand / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Area Of Additional Undeveloped Parcels Of Land With Option to Purchase | 63 bdn_AreaOfAdditionalUndevelopedParcelsOfLandWithOptionToPurchase / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Total potential development capacity | 6,000,000 bdn_TotalPotentialDevelopmentCapacity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Unconsolidated Real Estate Ventures [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net rentable square feet | 6,700,000 us-gaap_AreaOfRealEstateProperty / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember | 5,700,000 us-gaap_AreaOfRealEstateProperty / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember
Number Of Unconsolidated Real Estate Ventures | 17 bdn_NumberOfUnconsolidatedRealEstateVentures / dei_LegalEntityAxis = us-gaap_CorporateJointVentureMember |
Wholly-owned Management Company Subsidiaries [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net rentable square feet | 33,700,000 us-gaap_AreaOfRealEstateProperty / dei_LegalEntityAxis = bdn_ManagementCompanySubsidiariesMember |
Third Parties and Real Estate Ventures [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net rentable square feet | 8,900,000 us-gaap_AreaOfRealEstateProperty / dei_LegalEntityAxis = bdn_ThirdPartiesAndRealEstateVenturesMember |
Total Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 198 us-gaap_NumberOfRealEstateProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bdn_TotalPropertiesMember |
Office Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 161 us-gaap_NumberOfRealEstateProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bdn_OfficePropertiesMember |
Industrial Facilities [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 20 us-gaap_NumberOfRealEstateProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bdn_IndustrialFacilitiesMember |
Mixed Use Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 5 us-gaap_NumberOfRealEstateProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bdn_MixedUsePropertiesMember |
Retail Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 1 us-gaap_NumberOfRealEstateProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bdn_RetailPropertiesMember |
Core Properties [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 187 us-gaap_NumberOfRealEstateProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bdn_CorePropertiesMember |
Assets Held-for-sale [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 6 us-gaap_NumberOfRealEstateProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_AssetsHeldForSaleMember |
Development Property [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 3 us-gaap_NumberOfRealEstateProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bdn_DevelopmentPropertyMember |
Redevelopment Property [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 1 us-gaap_NumberOfRealEstateProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bdn_RedevelopmentPropertyMember |
Re-entitlement Property [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Number of Real Estate Properties | 1 us-gaap_NumberOfRealEstateProperties / us-gaap_PropertyPlantAndEquipmentByTypeAxis = bdn_ReEntitlementPropertyMember |
Wholly Owned Properties [Member] | Parent Company [Member] |  |
Organization of The Parent Company and The Operating Partnership [Line Items] |  |
Net rentable square feet | 24,800,000 us-gaap_AreaOfRealEstateProperty / dei_LegalEntityAxis = us-gaap_ParentCompanyMember / us-gaap_RealEstatePropertiesAxis = us-gaap_WhollyOwnedPropertiesMember |

X
- Definition Area Of Additional Undeveloped Parcels Of Land With Option to Purchase + References No definition available. + Details
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- Definition Area Owned by Company of Undeveloped Parcels Of Land + References No definition available. + Details
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Namespace Prefix: | bdn_
Data Type: | num:areaItemType
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X
- Definition Number of unconsolidated real estate ventures. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
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- Details
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- Definition The amount of development that can be supported by undeveloped land + References No definition available. + Details
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Namespace Prefix: | bdn_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | dei_LegalEntityAxis=bdn_ManagementCompanySubsidiariesMember
Namespace Prefix: |
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- Details
Name: | dei_LegalEntityAxis=bdn_ThirdPartiesAndRealEstateVenturesMember
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- Details
Name: | dei_LegalEntityAxis=us-gaap_CorporateJointVentureMember
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- Details
Name: | dei_LegalEntityAxis=us-gaap_ParentCompanyMember
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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_CorePropertiesMember
Namespace Prefix: |
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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_DevelopmentPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_IndustrialFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_MixedUsePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_OfficePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_RedevelopmentPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_ReEntitlementPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_RetailPropertiesMember
Namespace Prefix: |
Data Type: | na
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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=bdn_TotalPropertiesMember
Namespace Prefix: |
Data Type: | na
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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_AssetsHeldForSaleMember
Namespace Prefix: |
Data Type: | na
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- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_WhollyOwnedPropertiesMember
Namespace Prefix: |
Data Type: | na
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